DES MOINES, Iowa (AP) — Donald Trump’s absence from Thursday night’s debate put the spotlight on rivals Ted Cruz and Marco Rubio, who needs a strong showing in Iowa in order to stay in the top tier of candidates. The two senators were confronted with video clips suggesting they had changed their positions on immigration, one of the most contentious issues among Republicans. Each insisted the other had flip-flopped, and denied they had switched their own views allowing some people in the U.S. illegally to stay.

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